I believe the Retina display models also have soldered on RAM, which means you need to order it with the specs you'll need now and in the future. I ordered my recent MBP with the minimum RAM because it's much cheaper to buy RAM from Crucial. I don't think you can do that with the Retina display models.
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Mark
markj.pics
"Life is uncertain, eat bacon now."
-UncleWede
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